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4.3. Optimum dynamic condition for propeller-aspirator-pump aerator

Figure 4 4.3. Optimum dynamic condition for propeller-aspirator-pump aerator

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The aeration experiments were conducted in a brick masonry tank of dimension 5 x 3 x 1.5 m’. The ositional angle of propeller shaft (inclination of the shaft with the horizontal water surface) can bx hanged by changing the position of an arm attached to the supporting structure. The atmospheric air enter: 1rrough the hole A of the propeller shaft due to suction created by the aspirator. Water drawn through th ole B is thoroughly mixed with the air and is finally splashed into the atmosphere. Initially the tap wate: yas deoxygenated using 0.1 mg/L of cobalt chloride and 10 mg/L of sodium sulphite for each 1 mg/L o: issolved oxygen present in water [11]. Thereafter the aerator was operated at the desired conditions as pe 1e experimental design and readings were taken at timed intervals till DO increased from zero to about 80% aturation. The DO deficit was computed for each time. Finally the values of SOTR and SAE wer alculated using Eq. 1 and 2 respectively. Fig.1. Experimental setup for testing of propeller-aspirator-pump aerator.
The aeration experiments were conducted in a brick masonry tank of dimension 5 x 3 x 1.5 m’. The ositional angle of propeller shaft (inclination of the shaft with the horizontal water surface) can bx hanged by changing the position of an arm attached to the supporting structure. The atmospheric air enter: 1rrough the hole A of the propeller shaft due to suction created by the aspirator. Water drawn through th ole B is thoroughly mixed with the air and is finally splashed into the atmosphere. Initially the tap wate: yas deoxygenated using 0.1 mg/L of cobalt chloride and 10 mg/L of sodium sulphite for each 1 mg/L o: issolved oxygen present in water [11]. Thereafter the aerator was operated at the desired conditions as pe 1e experimental design and readings were taken at timed intervals till DO increased from zero to about 80% aturation. The DO deficit was computed for each time. Finally the values of SOTR and SAE wer alculated using Eq. 1 and 2 respectively. Fig.1. Experimental setup for testing of propeller-aspirator-pump aerator.
Fig.2. Variation of E with positional angle of propeller shaft.
Fig.2. Variation of E with positional angle of propeller shaft.
However, no unique relationship could be established between Re and E 4.2.2 Effect of Re and Fr on Ne
However, no unique relationship could be established between Re and E 4.2.2 Effect of Re and Fr on Ne
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